Unique Values in Dynamic Down List

Hello,

I'd like to automatically populate a drop-down list with the unique values contained in a table's column using the value of another column. So if my table looked like this:

REGION	OFFER
North	Learning Tools
North	Learning Tools
North	New Offers

I'd want the drop-down list to only show "Learning Tools" and "New Offers" when "North" is selected in a different cell (the attached table shows other regions). It would be great if the drop-down list is sorted - but not mandatory.

Is this possible without macros/VBA?

Thanks